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Gameboy Wearable

Date:          Tue, 10 Mar 1998 15:16:19 +0100
From:          etzlab5 <>
To:            
Subject:       Gameboy Project (fwd) -Antwort

The following message was a an answer to some questions I had.  Read 
it and then check out the page it corresponds to at:
http://www.home.fh-karlsruhe.de/~rama0013/GB_Project/GB_Docu.html

>>> Marc Rawer <> 10.03.98 01.59 >>>
Hi Kent,

>I am very interested in your gameboy project and have a few questions
>that are listed below.
Ok.

>I understand that you are hooking an EPROM to load your software on.
>So how much space can you get?
Hmm, I think I don't get you quiet wright here. Well we used an 32k*8
EPROM, because this is the max adressable space for the GB without
paging and mapping (see our documentation about this). The program
Steffen wrote is about 6k in lenght, so there is plenty of space left.
However we only made a simple (and through this small) i/o -proggy which
we used to show which bit is set on the PI/O or to set/unset the bits of the
PI/O.

>And what OS or tools, etc. are you running on it.
OS :-)) Well we are quite far away from an OS. In the moment there are
only some apps for the gameboy on the net. We used Jeff Frohwein's
GameBoy Basic to do some programming for test purpose. But if you use
the GameBoy Development Kit you will get a mighty C-compiler and you
can write your own files. To built up an OS the GB mightn't be the best
system, because it's hardware (ram/cpu) is very limited. Well on the other
hand, I just saw that some guys made up a linux for a palm pilot of some
kind, so maybe some day ... :)

>I would like to build one and was wondering approx. how much it would
>cost to build the expansion board that you are building?
This depends on how cheap you can rebuild the board itself. The chips
and stuff onboard is about 15-20$ all together.

>Also what exactly is the device that you are hooking up to your gameboy.
>I basically just want a drive of somesort to run an OS and some
>software.  What do you think?
The 'device' is a standart programmable input/output driver (82C55). This
circuit is sometimes used to adapt a floppy controller or a keyboard in the
CP-world. So for your purpose you should first try to connect a 3 1/2 floppy
drive to our adapter (refer to the end of the .pdf - file on the PIO on our site,
there is an example which could be of help). I would be very interested in
you achievments, but be prepared for a bit of hard work.

Yours,

Marc Rawer.

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